I've struggled with not being excited or motivated to do anything... you have to find something that you're passionate about. Try something new or as said above start excersing. It will keep your mind occupied and little by little you will forget the struggle and focus on what you care about more.
Possibly, try to rewire your thinking. While thinking that everything is meaningless try to reverse that and find meaning in something you love. In my opinion it all comes down to what you're passionate about. If you haven't found it, don't worry, it'll come once you are looking. And most importantly don't rush, everything comes in time.
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